fix: have executor self-report worktree metadata (#1349)

agents/gsd-executor.md

@@ -103,6 +103,24 @@ PLAN_START_EPOCH=$(date +%s)
 ```
 </step>
 
+<worktree_metadata_capture>
+If running inside a git worktree, capture authoritative worktree identity before
+any task commit changes HEAD. The execute-phase orchestrator consumes this from
+your final `<worktree_metadata>` return block to build the wave cleanup manifest
+without relying on runtime harness metadata (#1297).
+
+```bash
+GSD_WORKTREE_PATH=""
+GSD_WORKTREE_BRANCH=""
+GSD_WORKTREE_EXPECTED_BASE=""
+if [ -f .git ]; then
+  GSD_WORKTREE_PATH=$(git rev-parse --show-toplevel)
+  GSD_WORKTREE_BRANCH=$(git rev-parse --abbrev-ref HEAD)
+  GSD_WORKTREE_EXPECTED_BASE=$(git rev-parse HEAD)
+fi
+```
+</worktree_metadata_capture>
+
 <step name="determine_execution_pattern">
 ```bash
 grep -n "type=\"checkpoint" [plan-path]
@@ -761,6 +779,10 @@ into the user's project history.
 **Tasks:** {completed}/{total}
 **SUMMARY:** {path to SUMMARY.md}
 
+<worktree_metadata>
+{"agent_id":"{phase}-{plan}","worktree_path":"${GSD_WORKTREE_PATH:-}","branch":"${GSD_WORKTREE_BRANCH:-}","expected_base":"${GSD_WORKTREE_EXPECTED_BASE:-}"}
+</worktree_metadata>
+
 **Commits:**
 - {hash}: {message}
 - {hash}: {message}